1. last name the name used to identify the members of a family
  2. lastingness permanence by virtue of the power to resist stress or force
  3. lustiness the property of being strong and healthy in constitution
  4. autonomous existing as an independent entity
  5. past times the time that has elapsed
  6. last rites a Catholic sacrament
  7. Vietnamese a native or inhabitant of Vietnam
  8. vastness unusual largeness in size or extent or number
  9. hastiness overly eager speed (and possible carelessness)
  10. nastiness the quality of being unpleasant
  11. lasting lasting a long time without change
  12. last-place lowest in rank or importance
  13. elastance the reciprocal of capacitance
  14. tastiness pleasant palatability
  15. fastness a rate (usually rapid) at which something happens
  16. last mile the last walk of a condemned person to the execution place
  17. lastingly in an enduring or permanent manner
  18. Martinmas the feast of Saint Martin; a quarter day in Scotland
  19. pseudonymous bearing or identified by an assumed (often pen) name
  20. pastness the quality of being past